Initialize deviceId properly in _getDeviceId (https://github.com/amplitude/Amplitude-iOS/issues/20)
Initialize deviceId properly in _getDeviceId (https://github.com/amplitude/Amplitude-iOS/issues/20)

lopper/Amplitude-iOS,pollarm/Amplitude-iOS,amplitude/Amplitude-iOS,amplitude/Amplitude-iOS,amplitude/Amplitude-iOS,pollarm/Amplitude-iOS,amplitude/Amplitude-iOS,lopper/Amplitude-iOS